The skull is a very important organ in the human body, which plays an important role in protecting and supporting the brain and intracranial soft tissues as well as craniofacial organs, and is very important for maintaining normal life functioning and health. However, there are many risk factors in life that can cause damage to the skull and lead to cranial defects. This includes both adults and children. In both adults and children, cranial defects should be repaired promptly to prevent external damage to the brain and to prevent various cranial defect syndromes. Cranial repair surgery is very important, and the material used for repairing the skull is very important when patients with defects are repaired. There is a new type of polyetheretherketone PEEK material that is favored by patients with cranial defects and neurosurgeons for its excellent performance and good postoperative results. So do cranial repairs need to be replaced again in adulthood? Children with cranial defects should not be repaired immediately under the age of three, and it is recommended that the repair be done after the age of three. As long as the defective bone window does not cross the bone suture, the size and shape of the bone window will not change significantly, and the repair will not affect the growth, so it can be repaired and needs to be repaired as soon as possible. If the bone window crosses the bone suture, it is generally recommended to repair the skull after the age of 18, after the skull is basically set.